Crohn's disease is an often severe gastrointestinal illness with symptoms such as abdominal pain, disabling diarrhoea, and loss of appetite. Drug treatments are limited and there is no cure.
Up to 1 in 1000 people have Crohn's disease, and 1 in 750 have ulcerative colitis. Crohn's disease is prevalent in the USA, UK, Scandinavia and in Jews of Northern European origin. At least half million people are affected in the USA.